Purpose Performing precision equalization on the low-response detection units of electromagnetic calorimeter(ECAL),it is essential for precision energy measurements of Alpha Magnetic Spectrometer(AMS-02).Methods Cosmi...Purpose Performing precision equalization on the low-response detection units of electromagnetic calorimeter(ECAL),it is essential for precision energy measurements of Alpha Magnetic Spectrometer(AMS-02).Methods Cosmic helium nuclei are used instead of protons to perform the equalization.During the equalization,temperature effects are analyzed and corrected to improve the accuracy.Results The results of helium equalization are consistent with proton equalization,and the precision of helium equalization is about 1.5%.Conclusions The precision of helium equalization is better than that of proton equalization,which provides a reliable alternative to ECAL on-orbit equalization.展开更多
Purpose The Alpha Magnetic Spectrometer(AMS-02)will continuously collect data for the lifetime of the International Space Station(ISS).On-orbit equalization must be performed to ensure the accuracy of the AMS energy m...Purpose The Alpha Magnetic Spectrometer(AMS-02)will continuously collect data for the lifetime of the International Space Station(ISS).On-orbit equalization must be performed to ensure the accuracy of the AMS energy measurement(~1%)by the electromagnetic calorimeter(ECAL).Methods The equalization is performed using the most probable value(MPV)of the cosmic-ray proton minimum ionizing particle(MIP).Kalman filter technique is used to improve the precision.Results The precision of the equalization with proton MIP is(7.206±0.003)%and improved to(2.388±0.002)%after the Kalman filter.From the toy Monte Carlo(MC)simulation,the error of the energy reconstruction is about 1.4%and 0.5%due to the 7.2%and 2.4%equalization accuracy,respectively.Conclusion About 1.4%error due to~7%equalization precision does not match the AMS requirement.With the improvement from the Kalman filter,the energy reconstruction error from the equalization is reduced to 0.5%,which can fulfill the AMS requirement.展开更多
基金The project is supported byNationalKey Research and Development Program of China(2022YFA1604802)National Natural Science Foundation of China(11905238).
文摘Purpose Performing precision equalization on the low-response detection units of electromagnetic calorimeter(ECAL),it is essential for precision energy measurements of Alpha Magnetic Spectrometer(AMS-02).Methods Cosmic helium nuclei are used instead of protons to perform the equalization.During the equalization,temperature effects are analyzed and corrected to improve the accuracy.Results The results of helium equalization are consistent with proton equalization,and the precision of helium equalization is about 1.5%.Conclusions The precision of helium equalization is better than that of proton equalization,which provides a reliable alternative to ECAL on-orbit equalization.
基金This study was supported by the National Natural Science Foundation of China(11705220,11905238)the China Scholarship Council.
文摘Purpose The Alpha Magnetic Spectrometer(AMS-02)will continuously collect data for the lifetime of the International Space Station(ISS).On-orbit equalization must be performed to ensure the accuracy of the AMS energy measurement(~1%)by the electromagnetic calorimeter(ECAL).Methods The equalization is performed using the most probable value(MPV)of the cosmic-ray proton minimum ionizing particle(MIP).Kalman filter technique is used to improve the precision.Results The precision of the equalization with proton MIP is(7.206±0.003)%and improved to(2.388±0.002)%after the Kalman filter.From the toy Monte Carlo(MC)simulation,the error of the energy reconstruction is about 1.4%and 0.5%due to the 7.2%and 2.4%equalization accuracy,respectively.Conclusion About 1.4%error due to~7%equalization precision does not match the AMS requirement.With the improvement from the Kalman filter,the energy reconstruction error from the equalization is reduced to 0.5%,which can fulfill the AMS requirement.
